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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 27, 2019
Jan. 28, 2018
Jan. 26, 2020
Aug. 17, 2018
Jul. 01, 2017
Business Acquisition [Line Items]          
Goodwill $ 351,141   $ 351,141    
TrackNet          
Business Acquisition [Line Items]          
Finite-lived intangible asset       $ 3,000  
Goodwill 4,316     $ 4,300  
Other assets (liabilities), net 1,184        
Total consideration $ 8,500        
AptoVision          
Business Acquisition [Line Items]          
Indefinite-lived intangible asset - IPR&D   $ 2,300      
Goodwill   12,194     $ 12,200
Other (liabilities) assets, net   (3,875)      
Total consideration   34,619      
Core technologies | TrackNet          
Business Acquisition [Line Items]          
Estimated useful life 3 years        
Finite-lived intangible asset $ 3,000        
Developed technology | AptoVision          
Business Acquisition [Line Items]          
Finite-lived intangible asset   $ 20,000      
Customer relationships | AptoVision          
Business Acquisition [Line Items]          
Estimated useful life   3 years      
Finite-lived intangible asset   $ 4,000      
Minimum | Developed technology | AptoVision          
Business Acquisition [Line Items]          
Estimated useful life   6 years      
Maximum | Developed technology | AptoVision          
Business Acquisition [Line Items]          
Estimated useful life   7 years